ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS

Introduced: September 1968

Classification Context

Section:: MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
Subclass:: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS

Description

F04C covers rotary-piston and oscillating-piston positive-displacement machines and pumps designed to handle liquids. These devices employ rotating or reciprocating pistons to achieve precise volumetric flow control, making them suitable for applications requiring constant displacement per cycle independent of pressure. The classification encompasses gear pumps, vane pumps, screw pumps, and similar designs where mechanical action directly displaces fixed liquid volumes, excluding reciprocating piston machines with linear motion (covered under F04B) and centrifugal or dynamic pumps.

Scope Notes

Glossary: Pump Pumps means a device for continuously raising, forcing, compressing, or exhausting fluid by mechanical means Machine machines means a device that could equally be both an engine and a pump and not a device which is restricted to an engine or one which is restricted to a pump Positive displacement pumps pumps using pistons or other mechanical members to displace a working fluid in a working chamber, the dynamic effect on the fluid being of minor importance Positive displacement engines the energy of a working fluid is transformed into mechanical energy, in which variations of volume created by the working fluid in a working chamber produce equivalent movement of mechanical members, e.g. pistons transmitting the energy, the dynamic effect of the fluid being of minor importance Oscillating piston machine oscillating piston machines means a positive-displacement machine in which a fluid-engaging, work-transmitting member oscillates, e.g. a vane piston swinging back and forth about a fixed axis Reciprocating piston reciprocating pistons means a fluid-engaging, work-transmitting member of an reciprocating-piston type machine or pump that slides alternately back and forth usually along a straight line or path Rotary piston rotary pistons means a fluid engaging, work-transmitting member of a rotary-piston machine or pump that can completely rotate about a fixed axis or about an axis moving along a circular or similar orbit when operating, e.g. rotor having vanes or teeth Rotary piston machine means a positive-displacement machine in which a liquid-engaging, work-transmitting member rotates about a fixed axis or about an axis moving along a circular or similar orbit, e.g. machine with a rotor having vanes or teeth Cooperating members means the "oscillating piston" or "rotary piston" and another member, e.g., the working-chamber wall, which assists in the pumping action or machine's action Movement of the cooperating members is to be interpreted as relative, so that one of the "cooperating members" may be stationary, even though reference may be made to its rotational axis, or both may move Teeth or tooth equivalents include lobes, projections or abutments Internal axis type means that the rotational axes of the inner and outer co-operating members remain at all times within the outer member, e.g., in a similar manner to that of a pinion meshing with the internal teeth of a ring gear Working fluid working fluids means the driven fluid in a pump or driving or driven liquid in a machine. The working fluid can be in a compressible, gaseous state, e.g. steam, called elastic fluid, a liquid state, or a state where there is coexistence of elastic fluid and liquid state | Limiting references: Positive displacement machines for liquids, or pumps in which the working-fluid is displaced by one or more reciprocating pistons or by flexible working members

17 direct subcodes

Child Classifications

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F04C 11/00 Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
F04C 13/00 Adaptations of machines or pumps for special use, e.g. for extremely high pressures
F04C 14/00 Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
F04C 15/00 Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups
F04C 18/00 Rotary-piston pumps specially adapted for elastic fluids
F04C 19/00 Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
F04C 2/00 Rotary-piston machines or pumps
F04C 21/00 Oscillating-piston pumps specially adapted for elastic fluids
F04C 23/00 Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
F04C 25/00 Adaptations for special use of pumps for elastic fluids
F04C 27/00 Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
F04C 28/00 Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
F04C 29/00 Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups
F04C 3/00 Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members, e.g. of screw type
F04C 5/00 Rotary-piston machines or pumps with the working-chamber walls at least partly resiliently deformable
F04C 7/00 Rotary-piston machines or pumps with fluid ring or the like
F04C 9/00 Oscillating-piston machines or pumps